此文依据灰色系统理论，提出了应用ＧＭ（１，１）灰色模型对未完工程投资进行预测的方法，研究了利用残差模型修正的若干问题，并结合工程实例，取得了令人满意的结果。 Based on the gray system theory, this paper presents a method of forecasting the investment of the unfinished project by using the GM (1,1) gray model, and studies some problems that are corrected by using the residual model. Combined with the engineering examples, satisfactory results are obtained .